Ethyl 4-(difluoromethyl)-6-nitro-2-(trifluoromethoxy)pyridine-3-carboxylate
Ethyl 4-(difluoromethyl)-2-nitro-5-(trifluoromethoxy)pyridine-3-carboxylate
Ethyl 4-(difluoromethyl)-3-nitro-2-(trifluoromethoxy)pyridine-6-carboxylate
Methyl 3-(bromomethyl)-2-(difluoromethyl)-4-(trifluoromethoxy)pyridine-5-carboxylate